Recording instrument



(Yet. 2, 1928.

E. A. ILEMAN 'RECORDING'INSTRUMENT Filed Feb. 11, 1925 Patented Oct. 2, 1928.

UNITED STATES 1,686,326 PATENT OFFICE.

EMIL AUGUST ILEMAN, 0F QUEENS, NEW YORK, ASSIGNOR '1() AMERICAN SCHAEFIER AND BUDENBERG CORPORATION, A CORPORATION OF NEW YORK.

RECORDING INSTRUMENT.

Application fled February This invention relates to recording instruments and particularly to the operation of the marking means such as a pen or pencil adapted to make a record on a rotatable chart.

The object of the invention is to provide a simple inconspicuous automatic lifting means to raise the pen or ncil from the chart when the chart is to e positioned or removed.

Further objects of the invention particularly in the detailed structure of the lifting means will appear from the following description taken in connection with the accompanying drawings in which Fig. 1 is a partial face view with cover removed of a round chart recording. instrument provided with the lifting means of this invention.

Fig. 2 is a partial sectional view illustratingthe lifting means in side view.

- Fig. 3 is a side view of a modified form I of lifting means.

Fig. 4 is a sectional view on line 44 of Fig. 3.

Fig. 5 is a similar sectional view of the lifting means of Fig. 2.

In the embodiment of the invention shown in the drawings the recording instrument has a generally cylindrical casing 7 with a door 8, hinged to the casing at 9 so as to open and close. Within the casing 7 is a usual stationary chart holder 10 holding the chart 11 which is rotated upon the holder 10 in any desired manner as is also usual inthe art such as shown in the patent to Brown, No. 1.285.919. The marking device is the arm 12 carrying at its end a pen 13 adapted to mark on the chart 11 a record of the angular" positions of the vertical shaft 14 carrying the arm 12.

A long leaf spring lfihas one end 16 fastened to the under side of the holder 10 and is bent around in a curve 17 to a long free portion 18 extending under the holder and bent upward at 19 to extend through the cut-- out 20 into the space above the chart. Above the chart the spring is split into an end porsubstantially parallel to the surface of the chart and positioned between the chart and the arm 12. When the door 8 is closed it engages the end portion 21 and presses the spring inward and depresses the lifting 11, less semi N6. sea-9.

member 22 ciear cfthe arm 12. The lifting member 22 ma be twisted as shown at 23 so as to lie in a plane perpendicular to the arm 12 and be correspondingly stifi'.

The normal shape of the spring 15 is shown in Fig. 3 so that in the closed posi tion of the door 8 it is exerting through the end portion 21 an outward force tending to open the door; when the door is opened the spring will flex upwardly or outwardly and carry the lifting member 22 against the under side of the arm and thus lift or flex the arm 12 so as to raise the marking means 13 clear of the chart 11. The upward movement of the spring is iimited either by the upward movement of the arm 12 or by the engagement of the portion 18 of the spring against the under side of the holder 10. Instead of forming the spring from a single piece of metal the spring may, of course, be

uilt up of a number of pieces. for instance, as indicated at 15' and 22 in Figs- 3 and 4.

The lifting means of this invention is simple and practical in form being made out of flat spring, material and forming a unitary device fastened to the instrument at one point. On account of itsgreat length and correspondingly small angle of flexure the .metal will not fatigue and the spring. will retain its perfect resilience unaffected by use. In the positions shown in the instrument it is entirely protected so as to retain its form and not be bent or disarranged. And the positioning of the long springparts under the chart holder 10 gives the face of the instrument a neat and workmanlike appearance. At the same time the cost of making and installing this lifting means is reduced to a minimum. I Y

I claim:

As an article of manufacture a lifting device for the marking arm of a recording instrument adapted to carry a record sheet, comprising a part adapted to be fastened in fixed position behind said sheet. a resilient leaf spring extending from said fixed part back of said sheetto the edge of said sheet, I an end portion carried by the free end of tion 21 and a lifting member 22 extending said spring at the edge of said record sheet and extending to a point in front thereof. and a lifting member carried by said end member and adapted to be lifted to lift said marking arm when the spring is released.

EMIL AUGUST 

